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    Cat C15 NXS Injector trim files

    Hi Cat engine guru's. Does anyone know how to convert Cat injector trim file numbers into fuel delivery figures. I have been told that 5A503380548B gives a plus 2cc increase but I don't know what file it is compared with. I have a lazy NXS 475hp C15 that we have rerated to 550hp through Cat using the latest software. The engine has been lazy from new and now at 300,000 miles it has had new turbos, VVA heads, fuel transfer pump spring etc etc with no improvement. We have good results with non ACERT engines by having the injectors flow tested and adjusted to give all 6 the same flows and then using mild injector trim codes to increase fuel delivery from standard. Has anyone been here before?


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    Test the cac? Change the fls fts numbers, fuel temp resistor

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    Medium Load Member Jas's Avatar
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    PM Far_Call, he has spent time flowing Acert injectors on his bench and will be able to help you out.
    With the correct 550 file, good FLS and FTS settings most 550s go pretty good, you should make sure you dont have other issues before playing with injectors.
    Make sure the flash file you have is PM code 52.

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    The Acert ECM and programming will not allow you to default the trim files to the same file across all six injectors. You can't do what you want to do

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    Thanks for your help. I do not want to obviously reprogram this engine out of standard specs by changing FLS FTS or use resistors or power boxes. The vehicle is repaired by other dealers as well as ours. Thanks Jas we did change from PM 32 to PM 52 when we did the 550 uprate and it did make a big difference but still was still lazy compared with the 6NZ and 9NZ engines in the same fleet. Thanks Mr Haney, needing 6 unique trim files is a problem. How do fuel shops recondition these injectors and adjust flow rates? We have previous types recond and they all come back flow matched for 1100 codes to be entered. I have read the great info from Far_Call and others. There may be 6 different files that flow the same or similar. Thanks

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    <?xml version="1.0"?>
    <XMLFILE>
    <Header>
    <FileInfo>
    <FileVersion>1</FileVersion>
    <FileIdentifier>3875</FileIdentifier>
    <FileType>ETrim</FileType>
    </FileInfo>
    </Header>
    <OnboardData>
    <DataType>C200</DataType>
    <DataIndex>FFFFFFFF</DataIndex>
    <DataChecksum>FFFFB4FA</DataChecksum>
    <Data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ata>
    <AdditionalInformation>
    <UserVersion>0</UserVersion>
    <InjectorSerialNo>5A503380548B</InjectorSerialNo>
    <ETrimLockVersion>0300</ETrimLockVersion>
    <ECode>3137</ECode>
    <InjectorPartNum>2490709</InjectorPartNum>
    </AdditionalInformation>
    </OnboardData>
    </XMLFILE>


    A fairly High flowing Trim file but there is much better. Trouble is regardless of how high it needs to be matched to injectors so I wouldn't use it as you have 6 injectors so how do you balance those with 1 trim file????????????????

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    Thanks for your input Far_Call. I dont want you to give away your knowledge I was just trying to avoid reinventing the wheel and get my head around trim files. My 6 injector serial numbers are
    5A5150414317
    5A51504148B6
    5A515041519C
    5A515041408E
    5A51504122FE
    5A51504130E5
    Opening and reading each corresponding trim file shows Ecodes of 3397, 3062, 2188, 3269, 6476, and 5023
    Are the Ecodes the same as the previous type injector trim codes? and if so could we use the same code / flow data we have collected to find 6 trim files with similar but greater increases?
    Or could we use 1 trim file and rewrite the file version number 1,2,3,4,5, on the 5 other cylinders?
    I will do some tests when vehicle availability allows.
    We have changed the original FLS/FTS from -11/8 to 0/0 which is allowed by Cat when reflashing from PM32 to PM52 Heavy haulage option. This may or may not be an improvement. The correct and more expensive option is a PAR dyno test. Cheers

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    The E Code is not the trim Code!
    You can rename the one file but Cat did this for a reason and that was to stop people from using the same number in each cylinder due to the Variability in manufacture resulting in anything upto 10~20% fuel delivery..
    Do so at your own Risk!!! It will never run smooth or be as fuel efficient as it will when done properly. Having said that EX factory they can vary wildly also.
    I never do it this way and have seen too many do damage this way.. although some people think the Sledge Hammer approach is the way to go for quick cheap results.. IT WILL Cost you down the road no question about it.

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    Quote Originally Posted by Cetane View Post
    5A5150414317
    5A51504148B6
    5A515041519C
    5A515041408E
    5A51504122FE
    5A51504130E5
    There is a spread of 1.5cc or about 8% variation on those trims so to use all the same Trim file would be plum Crazy!!!

  10. #10
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    I agree 1.5cc is way too much. The object of the exercise is to impove the engine. Does this mean that fuel shops cannot recondition these injectors and we are stuck with using crappy Cat remanufactured ones. With 2KS C12's and 6NZ & 9NZ C15 we have 6 injectors serviced and flow equalised and then use codes to adjust performance. We can still have ACERT injectors serviced and flow equalised but cannot use the same trim code in each cylinder.

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